JP2009192088A - Cooling system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cooling system capable of saving energy while independently setting a temperature of cooling water by every mechanical appliance. <P>SOLUTION: The plurality of mechanical appliances are respectively provided with independent temperature regulation units comprising a storage tank 52, a cooling water circulation pump 54, a temperature detector 62 and a heat exchanger 56, and a cooling device 1 for supplying the cooled fluid to the heat exchangers 56 is connected thereto. The cooling device 1 includes a cooling tower 2 and a chiller unit 3, and the cooled fluid is cooled only by the cooling tower when an outside air temperature is low. The cooled fluid as a whole is controlled by a cooled fluid circulation pump 70 controllable by an invertor, and each independent temperature regulation unit is controlled by a flow rate of a flow rate control valve 66. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a cooling system that supplies cooling water to various machine facilities, and more particularly to a cooling system that has a plurality of die casting machines and plastic molding machines and supplies cooling water at different temperatures to the molding machine.

Conventionally, cooling water is supplied to mechanical equipment such as a die-cast molding machine and a plastic molding machine to keep the temperature of the molding die and mechanical equipment constant. As a facility for supplying cooling water, a refrigerator mainly composed of a chiller is used, and is provided for each mechanical facility. In particular, the molding die temperature is an important factor that affects the yield rate of molded products, and has a problem that heat exchange efficiency deteriorates due to rust, scales, etc. adhering to the cooling water channel.
In relation to this problem, Patent Document 1 discloses a die casting machine, an air separation device that takes air in the atmosphere and separates it into nitrogen gas and oxygen gas, and supplies cooling water to a die cooling circuit of the die casting machine. A cooling water supply device for performing the inspection, and a nitrogen gas mixing device for mixing the nitrogen gas into the cooling water, wherein the oxygen gas separated by the air separation device is provided in a cooling water tank for storing the cooling water. A die casting system is described that is fed to the mouth.

  On the other hand, a cooling water supply facility mainly composed of a chiller has a problem that it consumes a large amount of electric energy and does not meet the recent demand for energy saving. Therefore, Patent Document 2 and Patent Document 3 have a water cooler with an air-cooled refrigerator that cools cooling water using a refrigerant / water heat exchanger, and adjusts the cooling water to a predetermined temperature. An air-cooling heat exchange unit that cools the cooling water by directly applying outdoor air to a heat exchanger through which the cooling water passes is added to the existing cooling adjustment means that is supplied to the plastic molding machine. When the outside air temperature is lower than the first switching temperature in the vicinity of the cooling set temperature of water, the heat exchanger unit is used, and when the outside air temperature is higher than the second switching temperature in the vicinity of the cooling set temperature, the refrigerator There has been proposed a cooling system in which control means for controlling the use of a water chiller is added.

JP 2006-150395 A (pages 3 to 6) JP 2007-106045 (pages 5 to 6, FIG. 1) JP 2007-137070 (pages 4 to 6, FIG. 4)

  However, if the cooling water temperature setting is not changed for each product to be molded, there is an influence on the non-defective product rate. In the techniques described in Patent Documents 1 to 3, a cooling facility must be installed for each mechanical facility. In addition, the installation cost of the cooling equipment is not only high, but also energy saving is not sufficient.

  The present invention has been made in consideration of the above-described matters, and an object of the present invention is to provide a cooling system that can save energy while individually setting the cooling water temperature for each mechanical facility.

  The present invention is a cooling system for supplying cooling water to a plurality of mechanical equipment as heat load sources, a storage tank for temporarily storing cooling water, a cooling water circulation pump for supplying cooling water to the mechanical equipment, A temperature detector for detecting the temperature of the cooling water, and an individual temperature controller equipped with a heat exchanger in each of the plurality of mechanical facilities, and a return pipe and a return pipe of a cooling device for supplying a cooling fluid to the heat exchanger A cooling unit connected to each of the heat exchangers, the cooling device being connected to a forward pipe into which cooling fluid flows and a return pipe from which cooling fluid flows out, and cooling means for cooling the cooling unit A cooling tower including a compressor, a condenser, an expansion valve, and an evaporator, and a chiller unit having a refrigerant pipe through which the refrigerant circulates in this order. The condenser is disposed inside the cooling tower. And cooled by the compressor Is exchanged with the cooling medium fed from the cooling means, and is bypassed which is branched from the forward pipe and joins with the return pipe and is connected to a chiller pipe for flowing the cooled fluid to the evaporator A pipe, and a flow path switching means provided in the middle of the bypass pipe and in the middle of the forward pipe or the return pipe to flow the cooled fluid to the cooling unit or the bypass pipe, Is a cooling system characterized in that a cooling fluid circulation pump capable of inverter control is interposed and a flow rate control valve is provided at the cooling fluid inlet or outlet of the heat exchanger.

  According to the above configuration, the chiller unit only needs to be provided in the cooling device. Since the cooling device has a cooling tower, when the outside air is low, the chiller unit is stopped and cooled. Since the cooling fluid is cooled only by the tower, it is possible to provide an energy saving cooling system that consumes a minimum amount of electric energy. In addition, an inverter controllable cooling fluid circulation pump is provided in the forward pipe, and a flow rate control valve is provided at the cooling fluid inlet or outlet of the heat exchanger, so that the cooling water and heat supplied to each mechanical equipment are supplied. The cooling fluid to be exchanged can be appropriately supplied while controlling the flow rate. In addition, because each cooling system is equipped with a cooling water system, in the unlikely event that an abnormality occurs in the cooling water system of a specific mechanical facility, it can be handled individually without affecting other mechanical facilities. can do.

In the present invention, the individual temperature controller includes an individual control unit, and the individual control unit can control a valve opening degree of the flow rate control valve based on an output of the temperature detector. .
According to this configuration, the cooling water temperature required for each machine facility can be individually controlled.

In the above invention, the cooling system includes centralized control means, and the centralized control means receives individual cooling water temperature data and individual cooling water flow rate data from the individual control means,
The minimum temperature of the individual cooling water temperature data is output to the cooling device, and the integrated value of the individual cooling water flow rate data is output to a cooling fluid circulation pump. Preferably, the cooling temperature of the cooling fluid is determined based on the temperature, and the cooling fluid circulation pump determines the discharge flow rate based on the integrated value of the cooling water flow rate data.

  According to the above configuration, the cooling device is operated based on the minimum temperature required from each mechanical facility, and the cooling water circulation pump is operated based on the cooling fluid flow rate required for the entire cooling system. The cooling fluid can be supplied by consuming a minimum amount of energy.

Moreover, in this invention, it is preferable that the said individual temperature controller has a dissolved oxygen decreasing device of cooling water.
According to this structure, corrosion of a cooling water system can be prevented by reducing the dissolved oxygen of cooling water.

In the present invention, the storage tank preferably has an electric heater.
According to this configuration, it is possible to heat up to a predetermined water temperature at the start of operation in winter, etc., to reduce the number of times of disposal (molding that does not become a product) until the mold temperature becomes constant, and material loss , Energy loss can be reduced.

According to the cooling system of the present invention, the following excellent operational effects can be exhibited.
1) The chiller unit only needs to be provided in the cooling device. Since the cooling device has a cooling tower, when the outside air is low, the chiller unit is stopped and the cooling fluid is cooled only by the cooling tower. Therefore, it is possible to provide an energy saving cooling system that consumes a minimum amount of electric energy.
2) A cooling fluid circulation pump capable of inverter control is provided in the return pipe, and a flow control valve is provided at the cooling fluid inlet or outlet of the heat exchanger, so that the cooling water and heat supplied to each mechanical equipment The cooling fluid to be exchanged can be appropriately supplied while controlling the flow rate.
3) Since a cooling water system is provided in each machine facility, if an abnormality occurs in the cooling water system of a specific machine facility, it can be handled individually without affecting other machine facilities. can do.

Hereinafter, an embodiment of a cooling system according to the present invention will be described in detail with reference to the accompanying drawings.
FIG. 1 is a schematic view of a cooling system according to the present invention. FIG. 2 is a schematic cross-sectional view of an embodiment of a cooling device constituting the present invention. FIG. 3 is a chart showing an operation flow of the cooling device of FIG.

[Cooling system]
As shown in the figure, the cooling system 100 includes individual temperature controllers 50A, 50B,... Installed in a plurality of machine facilities 200A, 200B,..., Such as a die casting machine and a plastic molding machine. And the cooling device 1 for supplying a fluid to be cooled that exchanges heat with these individual temperature controllers.

  The individual temperature controller will be described as an example of the individual temperature controller 50A. A storage tank 52 for temporarily storing cooling water, a cooling water circulation pump 54 for supplying cooling water to the mechanical equipment 200A, and a heat exchanger 56. And a cooling water system 58 interposed in series, and the cooling water is circulated between the mechanical equipment 200A. A part of the cooling water branched from the cooling water system 58 is returned to the storage tank 52 via the dissolved oxygen reducing device 60. The cooling water system 58 includes a temperature detector 62 that detects the temperature of the cooling water, and the storage tank 52 includes an electric heater 64 so that the cooling water can be heated.

  On the other hand, the fluid to be cooled supplied from the cooling device 1 branches from the forward pipe 30a toward the heat exchanger 56 of each individual temperature controller, and is supplied to the heat exchanger 56 via the flow rate control valve 66. It has become so. And the to-be-cooled fluid after heat-exchanging with the heat exchanger 56 is made to return to the cooling device 1 via the return pipe 30b. Note that the ends of the forward pipe 30a and the return pipe 30b are connected via a bypass valve 68 so that the bypass valve 68 is opened and closed so that an overload is not applied to the fluid circulating pump 70 to be cooled. Reference numeral 72 denotes a server tank containing a fluid to be cooled.

  The flow control valve 66, the temperature detector 62, the electric heater 64, and the cooling water circulation pump 54 are connected to an individual control panel 74 that is an individual control means. The individual control panel controls ON / OFF of the electric heater 64 and the cooling water circulation pump 54, receives an output from the temperature detector 62, and outputs a valve opening instruction signal to the flow control valve 66. . That is, when the temperature is lower than the predetermined temperature, an instruction signal for closing the valve is output, and when it is higher than the predetermined temperature, an instruction signal for opening the valve is output.

  The individual control panel 74 provided in the individual temperature controller 50A is connected to the central control panel 76, and is configured to output cooling water temperature data and cooling water flow rate data from the individual control panel 74. The centralized control panel 76 selects the lowest temperature data among the cooling water temperature data output from the individual control panels and outputs the selected temperature data to the control panel (not shown) of the cooling device 1. Further, the coolant flow rate data is integrated, and the rotational speed of the cooling fluid circulation pump 70 obtained from the integrated value is output to the inverter control device 78.

  Therefore, the cooling device is operated based on the minimum temperature required from each mechanical facility, and the cooling water circulation pump is operated based on the cooling fluid flow rate required for the entire cooling system. The supply of the fluid to be cooled can be covered only by consuming.

  Here, since the fluid to be cooled is heat-exchanged with the cooling water via the heat exchanger 56, naturally the temperature of the fluid to be cooled needs to be lower than that of the cooling water. In order to effectively exchange heat for different cooling water temperatures, it is possible to have a temperature difference of 2 ° C. or more of the required cooling water temperature. However, if the temperature difference between the fluid to be cooled and the cooling water is 2 ° C., the heat exchanger becomes large, which is uneconomical. On the other hand, if the temperature difference between the fluid to be cooled and the cooling water is about 5 ° C., the heat exchanger can be compact, but this is not preferable in terms of energy saving. Therefore, it is desirable that the temperature of the fluid to be cooled discharged from the cooling device 1 is 3 ° C. lower than the minimum value of each predetermined cooling temperature output from the central control panel 76.

  The electric heater 64 may be a sheathed heater, for example, and may have a capacity capable of heating the cooling water system to a predetermined temperature in consideration of the morning rise lead time and the amount of the cooling water system held.

  The dissolved oxygen lowering device 60 is composed of, for example, an ejector described in Japanese Patent Application Laid-Open No. 2004-298793 and a deaeration device using the ejector, and is dissolved by adding nitrogen to cooling water to melt oxygen. Should be degassed.

[Cooling system]
Next, the cooling device constituting the present invention will be described in detail.
As shown in FIG. 2, the cooling device 1 includes a cooling tower 2 housed in a case (housing) 10 and a chiller unit 3 disposed below the cooling tower 2. Ventilation holes (louvers) 11 are provided to capture the air. The cooling tower 2 includes, in order from the top, a cooling fan (blower) 20b driven by a motor 20a, a watering tank 21 having watering holes (not shown) on the bottom surface, an inner peripheral side connected to an inlet header 22, and an outer peripheral side A sealed evaporative cooling unit 24 connected to the outlet header 23, a refill faucet 27 for replenishing cooling water sprayed to the cooling unit 24, and a water receiving tank 26 having a strainer 26a are provided. A watering pump 29 is provided in the middle of the connecting pipe 28 that connects the water receiving tank 26 and the watering tank 21. Although not shown, the cooling unit 24 includes a cooling pipe formed by winding a copper tube coil in a spiral shape. A forward pipe 30a is connected to the inlet header 22 in order to allow the fluid to be cooled to flow into the cooling unit 24, and the fluid to be cooled flowing out of the cooling unit 24 is allowed to flow to the evaporators 33a and 33b. A return pipe 30b is connected to the evaporator, and a chiller pipe 30d is connected to the evaporator to return the fluid to be cooled to an external device (not shown).

The chiller unit 3 includes a pair of compressors 31a and 31b, condensers 32a and 32b, evaporators 33a and 33b, expansion valves 34a and 34b, and refrigerant pipes 35a and 35b through which the refrigerant circulates. The condensers 32a and 32b have heat transfer pipes that are spirally wound although not shown, and each heat transfer pipe is connected to a pair of compressors 31a and 31b via inlet headers 36a and 36b. Further, it is connected to a pair of expansion valves 34a and 34b via outlet headers 37a and 37b. Further, in the chiller unit 3, the bypass pipe 30 c is branched from the middle (X ₁ ) of the forward pipe 30 a provided on the upstream side of the cooling unit 24, and the bypass pipe 30 c is provided on the downstream side of the cooling unit 24. The pipe 30b and its outlet (X ₂ ) join together and are connected to a chiller pipe 30d that passes through the evaporators 33a and 33b.

  In the middle of the bypass pipe 30c and the return pipe 30b, direction switching valves (two-way valves) 38a and 38b for switching the flow path of the fluid to be cooled are provided. The direction switching valve 38b may be provided in the middle of the forward pipe 30a. In addition, a temperature sensor 39a for detecting the inlet temperature of the fluid to be cooled, and an outlet temperature of the fluid to be cooled are provided in the vicinity of the inlet of the forward pipe 30a, in the vicinity of the outlet of the chiller pipe 30d, in the middle of the return pipe 30b and around the water receiving tank 26. A temperature sensor 39b for detecting the temperature, a temperature sensor 39c for detecting the temperature of the fluid to be cooled after passing through the cooling unit 24, and a temperature sensor 39d for detecting the temperature of the outside wet bulb are installed.

The apparatus for controlling the operation of the cooling device 1 includes an inlet temperature (T ₁ ) of the fluid to be cooled detected by the temperature sensor 39a, an outlet temperature (T ₂ ) of the fluid to be cooled detected by the temperature sensor 39b, and a temperature sensor. Based on the temperature (T ₃ ) of the fluid to be cooled after passing through the cooling unit 24 detected by 39c and the outside air temperature (T ₀ ) detected by the temperature sensor 39d, an open / close signal is sent to the control devices of the direction switching valves 38a and 38b. Including a sequencer that outputs

An example of the operation method of the cooling device 1 will be described. When the temperature (T ₀ ) of the outside air is lower than the set temperature (for example, 20 ° C.) (for example, in winter), the temperature of the cooling water is lowered to about 10 ° C., so the fluid to be cooled is cooled by the following procedure. That is, by outputting a signal for closing the direction switching valve 38a and opening the direction switching valve 38b from a sequencer (not shown), the high-temperature fluid to be cooled exchanged by an external device (not shown) The cooling water is uniformly sprayed to the cooling unit 24 from a large number of small holes provided on the bottom surface of the sprinkler tank 12 disposed in the upper part of the cooling tower 2, and the fluid to be cooled passing through the cooling coil is To be cooled. In this case, the sprinkled cooling water sequentially falls onto the lower cooling pipe while forming a water film on the outer peripheral surface of the cooling pipe, and the cooling pipe is cooled by the latent heat of vaporization of the water sprinkled there, and is covered by the cooling pipe. The cooling fluid is cooled.

  Here, the cooling water sprayed to the cooling unit 24 is supplied from the refill faucet 27 to the water receiving tank 26, and after the foreign matter is removed by the strainer 26a provided at the lower part of the water receiving tank 26, The water is pumped up by the watering pump 29 and fed to the watering tank 21. Further, the cooling unit 24 is cooled not only by the cooling water but also by the outside air introduced by the blower 20b. The fluid to be cooled cooled by the cooling unit 24 is fed from the outlet header 23 to the chiller unit 3, where it is absorbed by the cooling medium and then fed to the external device. In the chiller unit 3, the refrigerant (not shown) compressed by the compressors 31a and 31b is radiated by the condensers 32a and 32b, and is expanded and evaporated in the evaporators 33a and 33b via the expansion valves 34a and 34b. The endothermic cycle is repeated. In the condensers 32a and 32b, the refrigerant compressed by the compressors 31a and 31b, the cooling water fed from the water receiving tank 26 that is a part of the sprinkling means, and the outside air introduced into the cooling tower 2 are included. Heat exchanged.

  Next, when the outside air temperature is high (for example, 20 ° C. or higher) as in the summer or the middle of summer and winter, the temperature of the cooling water is 20 to 30 ° C. Therefore, the fluid to be cooled is cooled by the following procedure. Is done. That is, the direction switching valve 38a is opened from the sequencer and a signal for closing the direction switching valve 38b is output, so that the high-temperature fluid to be cooled that has flowed into the cooling device 1 does not pass through the cooling unit 2 and bypass pipe. It is fed to 30c and a bypass operation is performed.

This bypass operation is performed according to the procedure shown in FIG. In step S1, the inlet temperature (T ₁ ) of the fluid to be cooled detected by the temperature sensor 39a is compared with the temperature (T ₃ ) of the fluid to be cooled after passing through the cooling unit 24 detected by the temperature sensor 39c. If T ₁ is higher in temperature than T ₃ , the sequencer outputs a signal indicating that the direction switching valve 38 a is “closed” and the direction switching valve 38 b is “open”, and the fluid to be cooled is introduced into the cooling unit 24. (Step 2). On the other hand, when the temperatures of T ₁ and T ₃ are equal or T ₃ is higher than T _1, a signal indicating that the direction switching valve 38a is “open” and the direction switching valve 38b is “closed” is output from the sequencer. And the bypass operation is performed in which the fluid to be cooled is introduced from the bypass pipe 30c to the evaporators 33a and 33b without passing through the cooling unit 24 (step 3).

Then, the outside air temperature (T ₀₁ ) when the bypass operation is started is stored (step 4), and during the bypass operation, the current outside temperature (T0) and the outside temperature (T 0) when the bypass operation is started. ₀₁ ) is compared with a value obtained by subtracting a predetermined value (α) (step 5). The predetermined value (α) at this time is, for example, 1 ° C.

Whether or not to continue the operation when the current outside air temperature (T0) is equal to or higher than the value obtained by subtracting the predetermined value (α) from the outside air temperature (T ₀₁ ) when the bypass operation is started (Step 6), and when continuing, bypass operation is continued as it is. On the other hand, when the current outside air temperature (T0) becomes lower than a value obtained by subtracting a predetermined value (α) from the outside air temperature (T ₀₁ ) when the bypass operation is started, it is determined whether or not to continue the operation. (Step 7), when continuing, it returns to Step 1 again and judges an operating condition.

  Also, since the bypass operation may take a long time in summer or in the middle of summer and winter, if the bypass operation is not performed in order to save power consumption, the time for performing the bypass operation has passed that set time. If not, or if bypass operation is performed, the temperature at which the fluid to be cooled flows into the cooling device, the temperature at which the fluid to be cooled flows out from the cooling device, or the outside wet bulb temperature is detected, and that temperature is the reference value. Therefore, it is desirable to perform valve switching control. The bypass operation described above is an operation of closing the direction switching valve 38a and opening the direction switching valve 38b for a time set by a timer (for example, 2 minutes) at a frequency of, for example, 12 times per day (for example, every 118 minutes). This is executed by performing sequence control that repeats the above. By such valve switching control, the fluid to be cooled flowing into the cooling pipe is prevented from staying there. The set time by the timer (the time for opening the direction switching valve 38b) may be set to a time for which all the fluid to be cooled in the cooling unit 24 is replaced.

  Therefore, particularly when the outside air temperature is low, the chiller unit 3 can be stopped and the fluid to be cooled can be cooled only by the cooling tower 2 to cool the fluid to be cooled. The fluid to be cooled can be supplied in a high state.

  The cooling device is not limited to the structure shown in FIG. 2, and various modifications can be made. For example, in the above cooling device, an air cooling type cooling device in which a watering mechanism including a watering tank and a water receiving tank is omitted can be provided. According to this air-cooling type cooling device, the cooling capacity is slightly lower than that of the water-cooling type, and the power consumption is slightly increased. However, since the scale does not adhere to the cooling coil, there is an advantage that the maintenance inspection becomes easy.

  The cooling device is mainly installed outdoors. In this case, if the fluid to be cooled is brine (antifreeze), it is possible to prevent freezing in winter.

It is a schematic diagram which shows an example of the cooling system which concerns on this invention. It is a schematic diagram of the cooling system which concerns on this invention. It is a chart figure which shows the operation | movement flow of the cooling device of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1: Cooling device, 10: Housing | casing, 11: Louver 2: Cooling tower, 20a: Motor, 20b: Blower, 21: Sprinkling tank, 22: Inlet header, 23: Outlet header, 24: Cooling unit, 26: Receiving tank 26a: Strainer, 27: Refill faucet, 28: Connecting pipe, 29: Watering pump,
3: Chiller unit, 30a: Outward pipe, 30b: Return pipe, 30c: Bypass pipe, 30d: Chiller pipe, 31a, 31b: Compressor, 32a, 32b: Condenser, 33a, 33b: Evaporator, 34a, 34b : Expansion valve, 35a, 35b: Refrigerant pipeline, 36a, 36b: Inlet header, 37a, 37b: Outlet header, 38a, 38b: Direction switching valve, 39a, 39b, 39c, 39d: Temperature sensors 50A, 50B: Individual temperature Controller: 52: Storage tank, 54: Cooling water circulation pump, 56: Heat exchanger, 58: Cooling water system 60: Dissolved oxygen reduction device, 62: Temperature detector, 64: Electric heater, 66: Flow control valve, 68: Bypass valve 70: Cooled fluid circulation pump 72: Server tank 74: Individual control panel 76: Centralized control panel 78: Inverter control device 100: Cooling system , 200A, 200B: machinery and equipment

Claims (5)

A cooling system that supplies cooling water to a plurality of mechanical facilities that are heat load sources,
A storage tank that temporarily stores cooling water, a cooling water circulation pump that supplies the cooling water to the mechanical equipment, a temperature detector that detects the temperature of the cooling water, and an individual temperature controller that includes a heat exchanger. Provided for each of multiple mechanical facilities,
Connecting a forward pipe and a return pipe of a cooling device for supplying a cooling fluid to the heat exchanger to each of the heat exchangers;
The cooling device includes: a cooling tower including a cooling unit connected to an outgoing pipe into which cooling fluid flows in and a return pipe from which cooling fluid flows out; and a cooling means for cooling the cooling unit; a compressor, a condenser, and an expansion A chiller unit including a valve and an evaporator and having a refrigerant pipe through which the refrigerant circulates in this order. The condenser is disposed inside the cooling tower, and the refrigerant cooled by the compressor is cooled by the cooling unit. A bypass pipe which is heat-exchanged with the cooling medium fed from the means, is branched from the forward pipe and merges with the return pipe, and is connected to a chiller pipe for flowing the cooled fluid to the evaporator; A flow path switching means provided in the middle of the bypass pipe and in the middle of the forward pipe or the return pipe, and flowing the cooled fluid to the cooling unit or the bypass pipe,
A cooling system comprising a cooling fluid circulation pump capable of inverter control in the return pipe, and a flow rate control valve at the cooling fluid inlet or outlet of the heat exchanger. The individual temperature controller includes an individual control unit, and the individual control unit controls the valve opening degree of the flow rate control valve based on an output of the temperature detector. The cooling system described. The cooling system includes centralized control means, and the centralized control means receives individual cooling water temperature data and individual cooling water flow rate data from the individual control means,
The minimum temperature of the individual cooling water temperature data is output to the cooling device, and the integrated value of the individual cooling water flow rate data is output to a cooling fluid circulation pump. The cooling system according to claim 2, wherein a cooling temperature of the cooling fluid is determined based on a temperature, and the cooling fluid circulation pump determines a discharge flow rate based on an integrated value of cooling water flow rate data. . The cooling system according to any one of claims 1 to 3, wherein the individual temperature controller includes a dissolved oxygen reducing device for cooling water. The cooling system according to claim 1, wherein the storage tank includes an electric heater.

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